Addendum 2
Alum Sludge Storage Tanks
January 14, 2016
BID DATE:
Wednesday, January 20, 2016 at 3:00 PM (as originally advertised)
TO ALL BIDDERS:
Below are changes and or clarifications to the bid documents for this project. This Addendum forms a
part of the Contract Documents and modifies the original bidding documents as noted below.
Acknowledge receipt of this Addendum as required in the bid documents. Failure to do so may
subject Bidder to disqualification.
EXHIBIT A ATTACHED:
Attached Exhibit A includes Engineers clarifications and revisions to Technical Specifications and
Drawings.
QUESTIONS RECEIVED:
Q1.
Will CFPUA please provide a pdf copy of the existing PLC-8 “As-built” Control
Panel drawings to use as a reference for quantities and locations of the existing
ancillary hardware and I/O wiring that will be required to accommodate all existing
inputs and outputs to be re-terminated in the New PLC-8 Control Panel?
A1.
PLC-8 as-built drawings are available for review. Contact Project Manager at
jeff.theberge@cfpua.org to arrange.
Confirmed: There will be no wire and conduit provided under this contract to
accommodate the future addition of the identified signals. Surge protection shall be
provided for future signals and shall be in accordance with Specification Section
17560 requirements. It shall be assumed that all future signals originate in other
buildings.
Q2.
Will you please clarify the quantity or Bid requirements for providing both analog and
discrete Signal Surge Protection Devices to be installed and wired in the New PLC-8
Panel according to Section 17560?
A2.
Surge protection shall be provided for analog signals as specified in Section 17560,
subsections 2.01 and 2.03. Surge protection requirements of Section 17560 shall apply
to all pre-existing, new and future analog inputs and outputs to be terminated in the
new PLC panel. Surge protection is not required for discrete signals.
Q3.
Will you please clarify if all spare I/O will require surge protection to be installed and
wired for future use?
A3.
No spare I/O (pre-wired or other) will require surge protection. However, sufficient
space shall be required to install as needed in the future.
Surge protection shall be required for all applicable I/O that are labeled as “Future” in
Section 17920. Refer to Engineer Response A2., above.
Q4.
Will you please provide additional specifications for the desired Discrete Signal Surge
Protection Devices not described in Section 17560?
A4.
Surge protection is not required for discrete signals.
Q5.
Will you please clarify if Loop Diagrams are only required for New I/O provided in
this project since existing I/O wiring is unknown and not shown?
A5.
Confirmed: Loop diagrams are only required for new I/O to be provided under this
contract.
Q6.
The specification “MIC Coating System-Section 09800”, for the new concrete sludge
tanks, states SpectraShield or approved equal as the coating system. I would like to
suggest, as a greater than or equal, Raven 405 Lining System.
A6.
Raven 405 Lining System is acceptable.
Q7.
In paragraph 5.08 of the Supplementary Conditions, you are required include coverage
for “soft costs” to cover extra expenses incurred by the Owner due to delay in
occupancy from damage to property covered by this policy.
This coverage can be provided, but will be subject to a specific limit of liability. What
limit of liability do you want us to include in the builders risk quote for “soft costs?”
A7.
$100,000. in soft costs.
ACKNOWLEDGEMENT BY BIDDER. Bidder shall acknowledge receipt of this Addendum
No. 2 in the space provided in the Bid Form.
All other terms & conditions remain unchanged.
Julia Vosnock
Cape Fear Public Utility Authority
Procurement Manager
End of Addendum 2
Jeff Theberge
Cape Fear Public Utility Authority
Project Manager
Exhibit A
JAMES A. LOUGHLIN WWTP
LIQUID SLUDGE STORAGE TANKS
ADDENDUM NO. 2
SPECIFICATIONS:
SECTION 00003 – TABLE OF CONTENTS
00003-2
Add 09801 MIC COATING SYSTEM - EPOXY
SECTION 09801 – MIC COATING SYSTEM - EPOXY
Add this Section per Attachment 1
DRAWINGS:
M101
Delete Note 2 in its entirety and replace with:
“Model shall be Varec Biogas 5000 or Shand & Jurs 94309. Housing, bank
assembly frame, and sheet material shall be aluminum and hardware shall be
316 stainless steel.”
2
ATTACHMENT 1
SECTION 09801
MIC COATING SYSTEM - EPOXY
PART 1 -- GENERAL
1.01
THE REQUIREMENTS
A.
Furnish and install special coating systems in accordance with the Contract Documents.
B.
MIC Coating System
For the Screw Pump Station, install Microbiologically Influenced Corrosion (MIC) coating
system as indicated on the Drawings.
1.02
RELATED WORK SPECIFIED ELSEWHERE
A.
Section 03250- Concrete Accessories
B.
Section 03350- Concrete Finishes
C.
Section 03732 – Concrete Repairs
D.
Section 09900- Painting
1.03
A.
1.04
Without limiting the generality of these Specifications the Work shall conform to the applicable
requirements of the following documents:
1.
SSPC-SP13/NACE No. 6
Surface Preparation of Concrete
2.
NACE
National Association of Corrosion Engineers
3.
SSPC
The Society of Protective Coatings
4.
ASTM
American Society of Testing and Materials
SUBMITTALS
Shop Drawings including the following items shall be submitted in accordance with Section
01300.
1.
Manufacturer's product data and material safety data sheets for each coating product
provided. Include manufacturer’s color chart for each product supplied.
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A.
REFERENCE SPECIFICATIONS, CODES AND STANDARDS
ATTACHMENT 1
2.
Manufacturer’s installation instructions and recommendations specific to environmental
conditions, surface preparation, substrate conditions, and application procedures.
3.
Complete shop drawings including location and details for all terminations and
transitions.
4.
Certifications:
a.
Furnish affidavits from the manufacturer certifying that materials furnished
conform to the requirements specified.
b.
Certify concrete repair and coating products have been checked for
compatibility.
c.
Certification from manufacturer stating the applicator and applicator’s assigned
personnel are certified and have received specific training for the application of
the MIC coating system.
d.
Certificate from applicator stating the assigned personnel have received
specific training for the application of the MIC coating system.
e.
Submit manufacturer’s representative or independent inspector’s NACE or
SSPC certification.
5.
Submit manufacturer's representative name, address and telephone number who will
inspect work.
6.
Provide list of at least 10 applications in high H2S environments in Southern of MidAtlantic States including contact names, address, phone numbers and date of
installation for both the coating system and the applicator.
7.
Field Data Records and Installation Reports.
8.
Product Warranty.
9.
Closeout Submittals:
a.
As-built drawings which include coating application limits, transitions, and
terminations.
b.
Photos
c.
Quality assurance records, field data records and installation reports
d.
Certificate of Surface Preparation
e.
Test and evaluation reports including pull-off strength (adhesion) and spark
testing.
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1.05
f.
Final Report
g.
Final Certified Warranty
QUALIFICATIONS
A.
Products shall be manufactured by company specializing in manufacturing the products
specified in this section with a minimum of five continuous years of experience for performance
in similar applications in wastewater treatment plants and wastewater collection systems.
B.
The Contractor performing the work shall be fully qualified, experienced and equipped to
complete this work expeditiously and in a satisfactory manner and shall be an approved
installer of the coating system as certified and licensed by the manufacturer. The Contractor
shall have successfully installed a minimum of 5,000 square feet of the proposed system and
shall have a minimum of two years service as documented by verifiable references. There shall
be no exceptions to this experience requirement. The Contractor shall submit the following
information to the Engineer for review and approval before any work is performed. The
following information is required.
1.06
1.
The number of years of experience in performing this type of specialized work and in
installing the specified coating system.
2.
Name of the manufacturer and supplier for this work and previous work listed below.
3.
A list of municipal clients that the Contractor has performed this type of work including
names, phone numbers, and square feet of material installed.
4.
The Contractor shall submit a certified statement from the manufacturer that he/she is
a certified and/or licensed installer of the coating.
QUALITY ASSURANCE
A.
The supplier shall be responsible for the provisions of all test requirements specified in the
referenced ASTM Standards as applicable. The supplier shall also bear the cost of all tests
specified in Paragraph 3.05, Field Testing and Acceptance of MIC Coating System. In
addition, all coating products to be installed under this Contract may be inspected at the plant
for compliance with these specifications by an independent testing laboratory provided by the
Owner. The Contractor shall require the manufacturer’s cooperation in these inspections. The
cost of plant inspection of all products and materials approved for this Contract shall be borne
by the Owner.
B.
Inspections of the coating products and materials may also be made by the Engineer or other
representatives of the Owner after delivery. The products and materials shall be subject to
rejection at any time on account of failure to meet any of the Specification requirements, even
though samples may have been accepted as satisfactory at the place of manufacture.
Materials rejected after delivery shall be marked for identification and shall be removed from
the job at once.
1.
Provide adequate time and access for inspections for the following major activities:
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C.
Pre-surface preparation
b.
Monitoring of surface preparation
c.
Post-surface preparation
d.
Monitoring of repair and resurfacing product application
e.
Post repair and resurfacing products
f.
Monitoring of coating application
g.
Post application inspection and testing
h.
Corrective actions and final inspection
Pre-installation Meeting
1.
D.
a.
At least two weeks prior to beginning work, the Contractor shall conduct a Preinstallation Meeting to discuss coating procedures and submittals. Attendees shall
include the Coating Applicator, Owner, Engineer, Manufacturer’s Technical
Representative, Testing and Inspection Agencies (if applicable), Concrete Repair
subcontractor (if applicable) and the Contractor. The minimum agenda includes:
a.
Environmental condition requirements
b.
Surface temperature requirements
c.
Surface pH requirements
d.
Surface preparation procedures
e.
Cleaning procedures
f.
Testing procedures to determine moisture content of concrete
g.
Proper procedures to fill substrate
h.
Application equipment
i.
Proper application of primer
j.
Proper application of coating system
k.
Proper termination, transition and cant cove details
l.
Inspection of coating during and after application
m.
Testing of coating.
n.
Repair methods
o.
Documentation requirements
p.
Approval Procedures
Field Data Records
1.
Maintain daily Quality Assurance Records including the following:
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1.07
a.
Date
b.
Atmospheric Temperature and Humidity
c.
Substrate pH
d.
Substrate Temperature
e.
Dew Point
f.
Product Batch Numbers
g.
Mixing Time for Each Part and the Combined Parts of a Coating System
h.
Pot Life
i.
Curing Time of Primer and Finish Layers
j.
Holiday Test Results and Repair Data
k.
Foreman or Supervisor's Signature
SERVICES OF MANUFACTURER'S REPRESENTATIVE
A.
Provide the services of a qualified manufacturer's technical representative who shall
adequately supervise the surface preparation and application of the coating and lining
products. The manufacturer’s representative shall be available to evaluate the coating at each
step through the process and shall supervise the lining or coating application until the installer
has shown through the proper surface preparation and application of the lining or coating that
the system will be installed in accordance with all manufacturer recommendations.
B.
Manufacturer’s technical representative or authorized inspector shall be currently certified by
NACE or SSPC.
C.
A manufacturer’s technical representative shall observe the application of the complete system
a minimum of two days at the beginning of the application at each structure specified to receive
MIC coating system. The manufacturer’s technical representative shall provide guidance to
ensure proper application of the system.
D.
The manufacturer's technical representative shall submit to the Engineer a final report, at the
completion of the work, identifying the products used, verifying and certifying that surfaces and
lining systems were properly applied, free of pinholes, blisters and other blemishes that will
compromise the coating performance and that the coating systems were proper for the
exposure and surface. Discrepancies that are found during the final inspection shall be
repaired and reinspected until system is completely satisfactory.
1.08
DELIVERY, STORAGE AND HANDLING
A.
Care shall be taken in shipping, handling and placing to avoid damaging the products. Extra
care may be necessary during cold weather construction. Any product or material damaged in
shipment shall be replaced as directed by the Engineer.
B.
Products shall be delivered to the site in clearly labeled containers and packaging. While
stored, the products shall be adequately packaged and protected. Products shall be stored in
a manner as recommended by manufacturer.
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C.
1.09
Any product showing deterioration, or which has been exposed to any other adverse storage
condition that may have caused damage, even though no such damage can be seen, shall be
marked as rejected and removed at once from the work.
WARRANTY
A.
All lining and coatings installed shall be guaranteed by the Contractor for a period of two years
from the date of final acceptance. During this period, all defects discovered in the coating, as
determined by the Owner or Owner’s Engineer shall be repaired or replaced in a satisfactory
manner by the Contractor at no cost to the Owner.
B.
The Contractor is responsible for properly preparing the structures for coating prior to the
installation of the systems, including stopping all leaks, patching voids, protecting or removing
and handling all mechanical equipment such as valves and valve assemblies and weirs,
cleaning surfaces, removing rubble, etc.
PART 2 – PRODUCTS
2.01
PRIMER
A.
Primer shall be moisture tolerant, suitable for the environmental conditions, and compatible
with the MIC coating. Primer shall be conductive for purposes of holiday testing, shall meet the
requirements of NFPA 99/ASTM F150 and shall comply with the requirements for conductive
underlayments in ASTM D4787, Standard Practice for Continuity Verification of Liquid or Sheet
Linings applied to Concrete Surfaces. Primer shall be as recommended and preferably
manufactured by the manufacturer of the MIC Coating System.
B.
Primer shall be as recommended by the coating manufacturer to achieve a superior coating
system performance. Manufacturer shall select primer based on substrate moisture,
environmental conditions and humidity, substrate temperature, pH, and other properties.
2.02
MIC COATING SYSTEM
A.
Provide MIC Coating System on surfaces indicated to receive MIC Coatings in this
specification and on drawings. MIC Coating System is to be applied only by Factory Trained
and Certified Applicators.
B.
The MIC Coating shall be an epoxy mortar system such as Raven 405 as manufactured and
applied by Raven Lining Systems. Additional approved systems include: Sauereisen
Sewergard 210S, and Sherwin-Williams, Cor Cote FRE. Cor Cote FRE product shall be top
coated with Cor Cote SC.
C.
The MIC Coating shall be applied in two (2) coats of 30 to 40 mils each for a total DFT of 60 to
80 mils. In addition to MIC Coating, fill bugholes, depressions, and irregularities in surfaces
with any dimension greater than 0.0625 inch with epoxy filler recommended by manufacturer
and apply primer at 10 mils recommended by manufacturer to achieve superior performance.
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D.
All inside corners of areas to be coated shall be filled with a continuous 45-degree cant cove
using 100% solids epoxy filler product as recommended by manufacturer prior to coating.
E.
MIC Coating System shall meet the following minimum characteristics:
1.
Total Film Thickness of System including primers shall not be less than 70 mils (unless
otherwise noted).
2.
Chemical Resistance of 10% of sulfuric acid.
3.
Water Vapor Permeance of 0.002 perms per ASTM E96, Method E.
4.
Concrete Tensile Pull Strength 350 psi ASTM D4541.
5.
Tensile Strength of 2,750 psi ASTM D412.
6.
Abrasion Resistance, CS17 Wheel <120mg loss, ASTM D4060, 1000 gm load/1000
cycles.
7.
Minimum Shore Hardness D50, ASTM D2240.
8.
Resistant to negative water infiltration.
9.
100% solids epoxy mortar system containing aggregate and/or fiber reinforcement.
PART 3 -- EXECUTION
3.01
A.
3.02
PROTECTION OF IN-PLACE CONDITIONS
Equipment, vehicles, buildings, and other finished items shall be protected from damage and
overspray. Sensitive equipment shall be wrapped in plastic and tape.
SURFACE PREPARATION
A.
Surfaces to receive coating shall be clean and free of dirt, oil, grease, and other foreign
materials.
B.
Concrete and masonry surfaces shall cure for 28 days minimum prior to coating. Moisture
content of concrete and masonry surfaces shall conform to manufacturer's recommended
limits, and as listed in SSPC-SP13/NACE 6 Section 6 Acceptance Criteria Table 1. Surfaces
shall be tested in accordance with ASTM D4263 – Plastic Sheet Test, ASTM F1869 – Calcium
Chloride and ASTM F2170 – Relative Humidity Gauge as recommended by the manufacturer.
C.
Test surfaces to ensure they are within requirements of the manufacturer. Do not begin coating
work until moisture is within manufacturer’s recommended range. Any leaks shall be repaired
as all surfaces shall be free of visible moisture and floating water.
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D.
Minimum surface preparation of concrete shall be per Section 09900, SSPC 13, and
provide a surface profile as required by the coating manufacturer. Remove all laitance,
weak concrete, dirt, and other contaminants. Remove all fins, protrusions, and similar
imperfections to allow a uniform surface after surface preparation. All outside corners or
sharp edges to receive coating shall be ground smooth and rounded to a minimum radius
of 0.5”. Under no circumstance shall surface preparation be less than manufacturer’s
recommendation to provide the best possible installation. Moisture levels of concrete shall
be tested and documented and within acceptable ranges prior to application of coating.
E.
Bugholes, depressions, and irregularities in surfaces with any dimension greater than 0.0625
inch shall be filled with epoxy filler recommended by manufacturer.
F.
Apply epoxy filler product recommended by manufacturer to all inside corners of areas to
be coated with a margin trowel to form a continuous 45-degree cant cove across corners
with a minimum dimension of 1.5-inch. Roughen or prepare cured epoxy filler as
recommended by coating manufacturer for proper coating adhesion.
G.
Where the surface deterioration is less than or equal to 1/2 inch (as measured from the final
finished surface to the prepared surface to be repaired) skim coats of epoxy modified
cementitious mortar shall be applied to restore and smooth surface irregularities to the final
finished surface. Epoxy modified mortar system shall be manufactured by same manufacturer
of MIC Coating System.
H.
Where the surface deterioration is greater than 1/2 inch the surface shall be repaired to final
finished surface using Spall Repair Patching Material, in accordance with Section 03732.
Surface material shall be applied in strict accordance with manufacturer's printed instructions
and recommendations. Materials shall be cured a minimum of 10-days or as recommended by
the repair material manufacturer for the site conditions. Manufacturer of MIC Coating System
shall confirm proposed spall repair patching material is compatible with MIC Coating System.
I.
Where manufacturer requires additional surface preparation, to provide best possible
installation, additional requirements shall be performed.
J.
Provided written certification on the coating manufacturer’s letterhead, signed by an officer of
the company that the surface preparation meets the requirements of the coating manufacturer.
3.03
A.
3.04
A.
PRIMER APPLICATION
Apply tolerant primer at 10 mils or as recommended by manufacturer to achieve superior
performance. Test moisture and pH levels of concrete and document. Apply primer when
surface is within acceptable ranges prior to application of primer.
MIC COATING APPLICATION
All methods, procedures of mixing, application and curing of the coating material shall be
accomplished in strict accordance with manufacturer's printed instructions and
recommendations.
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B.
Apply MIC Coating in a minimum of two coats in addition to primer and filler. Apply MIC
coating in two (2) coats of 30 to 40 mils each for a total DFT of 60 to 80 mils in strict
accordance with manufacturer’s printed instructions and recommendations.
C.
Application shall be by certified and experienced personnel only. Application of coating
systems shall take place when the temperature of the concrete is stable or falling to ensure a
minimal amount of out gassing by concrete. Use dehumidification units, fans or other means to
provide an adequate environment for application and cure when the environment is not
adequate for application or cure.
D.
Application shall produce at a minimum a totally bonded coating, corrosion proof, free of
blisters, pinholes and any and all blemishes that may be precursors to failure. Promptly correct
or remove, and repair areas that fail visual inspection or testing. Recoat time between coats
shall be documented and shall not exceed manufacturer’s requirements. Where recoat times
are exceeded the coating shall be prepared in strict accordance with manufacturer’s
recommendations including scarification to provide sufficient profile.
E.
Follow manufacturer’s recommendations for terminating coating around piping, openings and
gates, for terminating coating at top and bottom of walls, providing 1.5” radius inside corners,
and easing outside corners. Provide a 1-1/2 inch cant cove at all inside corners.
3.05
FIELD TESTING AND ACCEPTANCE OF MIC COATING
A.
Field acceptance of the MIC coating system shall be based on the Engineer’s evaluation of the
appropriate installation of each coat per field inspections, on observation of the measurements
of the wet film thickness, and on the observation of spark testing and adhesion testing
conducted on the cured liner.
B.
Pre-application testing shall be conducted by applying the MIC Coating at 20 mil thickness over
a 5 square foot area where directed to demonstrate the coating application to the inspector(s).
C.
During application of each layer of the MIC coating, the Contractor shall measure the thickness
and uniformity of the coating by the use of a wet film thickness gage meeting the requirements
of ASTM D4414. The wet film thickness shall be tested continuously for the Contractors own
use. At least three such tests will be observed by the Engineer or Owner for each coat in each
500 square feet.
D.
The MIC coating shall provide a continuous monolithic surfacing with uniform thickness
throughout and be free of pinholes, slumps and drips.
E.
All surfaces shall be inspected via high voltage spark testing when all coating work is complete
and the coating is hard to the touch.
1.
The structure environment shall be properly vented prior to testing to ensure hazardous
conditions do not exist.
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2.
High voltage spark testing shall be performed in accordance with ASTM D4787. The
spark testing equipment shall be initially set at 100 volts per 1 mil of applied film
thickness of the coating and then adjusted as necessary per ASTM D 4787.
3.
All detected holidays shall be marked and the area of the liner shall be repaired. The
surface area around the coating shall first be abraded using an appropriate grit paper
or other hand abrasion tool. After abrading and cleaning the area, the area shall be
patched by hand application of the coating material. All repair procedures shall follow
manufacturer’s recommended procedures.
F.
The pull-off strength (adhesion) of the liner shall be tested using any one of the five Test
Methods (A, B, C, D or E) described in ASTM D-4541. The Contractor shall propose the
method and equipment to be used in the tests. The liner adhesion shall be tested in one area
for each structure or each 1000 square feet of coated area. At least three replicate pull-off tests
shall be performed for each area. The Contractor shall also submit his proposed method for
reinstatement of the area of the coating affected by the test. Repair of test areas shall be made
by the Contractor at no additional cost to the Owner.
G.
There shall be no groundwater infiltration or other leakage through the structure walls after
coating. If leakage is found, it shall be eliminated with an appropriate method as recommended
by the coating manufacturer and approved by the Engineer at no additional cost to the Owner.
H.
All pipe connections shall be open and clear.
I.
There shall be no cracks, voids, pinholes, uncured spots, dry spots, lifts, delaminations or other
type defects in the lining.
J.
If any defective coating is discovered after it has been installed, it shall be repaired or replaced
in a satisfactory manner within 72 hours and at no additional cost to the Owner. This
requirement shall apply for the entire guarantee period.
- END OF SECTION -
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